(bugfix):fix iOS non-english input issue

Author: cht8687

packages/textfield/Input.svelte

@@ -29,14 +29,17 @@
   export let dirty = false;
   export let invalid = false;
   export let updateInvalid = true;
+  export let inputType = 'insertText'
 
   let element;
   let valueProp = {};
 
   $: if (type === 'file') {
     delete valueProp.value;
   } else {
-    valueProp.value = value === undefined ? '' : value;
+    if (inputType !== 'insertCompositionText') {
+      valueProp.value = value === undefined ? '' : value;
+    }
   }
 
   onMount(() => {

packages/textfield/Textfield.svelte

@@ -34,14 +34,15 @@
     {:else}
       <Input
         {type}
+        {inputType}
         {disabled}
         bind:value
         bind:files
         bind:dirty
         bind:invalid
         {updateInvalid}
         on:change
-        on:input
+        on:input={updateInputType}
         {...((fullwidth && label) ? {placeholder: label} : {})}
         {...prefixFilter($$props, 'input$')}
       />
@@ -131,6 +132,7 @@
   let textField;
   let addLayoutListener = getContext('SMUI:addLayoutListener');
   let removeLayoutListener;
+  let inputType = 'insertText';
 
   $: valued = value !== uninitializedValue || files !== uninitializedValue;
 
@@ -158,6 +160,10 @@
     removeLayoutListener = addLayoutListener(layout);
   }
 
+  function updateInputType(e) {
+    inputType = e.inputType
+  }
+
   onMount(() => {
     textField = new MDCTextField(element);